GOOD NEWS....
Thank god my one cat does not eat all his food in one sitting....
I checked his food before I put it down - nothing!
He didn't eat it all so I put it on the counter for a half an hour. I just went to put it back down and found a piece of plastic in the food that was left. This was the chunkier ground meat....
I'd say that the piece I found was a good portion of the plastic so I will continue to monitor his food to find the other portion. Atleast I now know it is in the chunkier ground meat.....WHEW
Thanks for the help - I get so concerned about the welfare of my cats!!!